not once

基本解释

Not once in three months!
三個月，一次也沒有！
Not once a day, but twice a day. Sometimes three.
不是一天一次，而是一天兩次，甚至是三次。
Not once in my conversations with him have I heard him talk about any ethnic group in derogatory terms, or treat whites with whom he interacted with anything but courtesy and respect.
在我與他的談話中，從來沒聽到過他用貶損的語言談及其他族裔，也沒看到哪一次他不是用禮貌和尊重來對待與他交往的白人。

Not once did I question this fact. My mind told me I was on Mars as your mind tells you that you are upon Earth.
But you'll see that once you get to final projects frankly, you're not gonna want to implement everything from scratch.
但是一旦你得出了最終方案，你就不會願意利用框架去,實現任何功能了。
哈彿公開課 - 計算機科學課程節選
Once each time. Right? I only do one swap potentially, it-- though not one potentially, each time at the end of the loop I do a swap.
每次循環做一次，對麽？我其實,就可能做了一次交換，也許竝不是可能，每次循環的結束我都得做一次交換。
麻省理工公開課 - 計算機科學及編程導論課程節選

Perhaps problems big enough to shake the entire system are not once-a-century events, but once-a-decade events.
FORBES: Christmas, Kurtosis, Fat Tails, Black Swans And Risk Management, Pt. 2